Center for Food Safety

This comprehensive report reveals the severe impacts of herbicide-resistant genetically engineered (GE) crops on the monarch population, which has plummeted over the past twenty years. The report makes it abundantly clear: two decades of Roundup Ready crops have nearly eradicated milkweed – the monarch caterpillar’s sole source of food – in cropland of the monarch’s vital Midwest breeding ground. At the urgent request of scientists and public interest groups, the U.S. Fish and Wildlife Service is currently considering listing the monarch as a threatened species under the Endangered Species Act.

Monarchs in Peril: Executive Summary

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Monarchs in Peril: Herbicide-Resistant Crops and the Decline of Monarch Butterflies in North America